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Question

A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig.) would correctly represent the result? Justify your choice.


A
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B
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C
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D
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Solution

The correct option is D

Explanation for correct option

(D)

Latent heat of fusion

  • The heat energy required to change 1kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
  • This process results in the molecules within the substance becoming less organized.

Heating a beaker containing ice and water

  • The mixture's temperature would be zero at the beginning of the experiment since water and ice are in equilibrium.
  • Due to the latent heat of fusion, the temperature of the beaker's contents does not initially increase.
  • As a result, the temperature remained constant for a while.
  • The temperature of the water slowly rises as the mixture is heated further by the students.
  • The temperature of content in the beaker as a function of time is as follows:

Explanation for incorrect options

  • Figure (D) measures the temperature of the content of the beaker as a function of time correctly.
  • Hence. all the other options (A), (B) and (C) are incorrect.

Therefore, the correct portion is (D).


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